Question

What are prepositions?

Answer 1

a preposition shows relationship of noun or pronoun with another word of sentence.

Answer 2

A preposition is a word which precedes a noun  to show the noun's  relationship to another word in the sentence.The word preposition comes from the idea of being positioned before. It is not true to say that a preposition always precedes a noun or a pronoun, but it does most of the time